WHILE THEY CHARGE YOU FOR CHECKED BAGS AND THEN LOSE THEM, airlines want to make your carry-on bags smaller.

Just when you thought flying couldn’t get any more annoying, some major international airlines and their trade association have decided your carry-on bag is too big for their overhead bins. They’d like you to buy a new, smaller one.

The International Air Transport Association (IATA) announced new bag-size guidelines last week that would make most existing carry-on bags oversize, presuming airlines formally adopt the change.

With the kind of reassurance that should make you check your wallet, IATA says this is “designed to make things easier for … the passenger.” That bag you paid $100 or $200 or more for? You could still bring it aboard, but now it could be the first to be gate-checked and put in the cargo hold when the bins fill up.

Let’s break this down. When airlines started charging for checked luggage, they created a land rush for overhead bin space. Carriers made the battle worse by rarely enforcing the bag-size standards they had already imposed. That’s why that “carry-on” the size of Montana is already occupying most of the bin above your seat when you get there. Airlines then found a way to profit from the inevitable bin anxiety by selling the right to board early and get to the bins quicker.

It’s a vast experiment to see how miserable they can make flying without people just quitting.